Screw-cutting machine.



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APPLIOATION FILED JUNE 12, 1906.

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No. 852,641. PATENTED MAY 7, 1907.

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APPLICATION FILED JUNE 12, l1906.

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No. 852,641. l C PATENTE!) MAY 7, 1907.

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SCREW CUTTING MACHINE.

APPLICATION FILED JUNE 12, 1906.

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CARL VOGELSANG, OF SOLINGEN, GERMANY.

SCREW-CUTTBNG MACHINE..

Specification of Letters Patent.

Patented May 7, 1907.

Application filed June 12,1906. kvSerial No. 321,343.

T0 LM whom, it may concern:

Be it known that I, CARL VoGELsANG, a subject of the German Emperor, residing at Solingen, Germany, have invented new and useful Improvements in Screw-Cutting Machines, of which the following is a specification.

This invention relates to a screw cutting machine which is so constructed that the cutting tool travels along the rotating screw blank for a number of times, in order to gradually deepen the thread.

In the accompanying drawings Figure 1 is a side elevation, Fig. 2 a plan and Fig. 3 an end view of the whole machine. Fig. 4, and especially Figs. 5, 6 et 7 are intended to illustrate the details of the invention in question.

' The tappet or cam 1 serves to advance and retard the cutter and the tappet or cam 2 to effect a radial drive of same against the bolt, while the tappet or cam 3 carries it along the bolt (axially) to be screwed. The tappets 1 & 2 are on the shaft 4, the tappet 1 being hXed, while the tappet 2 is loose and is actuated by a special or separate gear in such a manner that it makes only one revo lution while tappet 1 makes a number of turns. The tappet 3, which is on the shaft 5 has, on the other hand, the same number of revolutions as the tappet 1. The drive of the tappets is effected by the pulley 20 on the shaft 21 on which is the device carrying the bolt to be screwed. The shaft 21 carries a spur wheel 22 which engages with a wheel 23 which, in turn, is connected with the wheel 24. This latter drives the wheel 25 on the driving shaft 4 which communicates its movement to the wheel 26 and its shaft 27. On this latter there is the spur wheel 28 which engages into the wheel 29 which is connected with the tappet 2. The tappet 3 is driven by the bevel gear 30, 31 which is actuated by the shaft 4.l

Cam 1, which is substantially circular, with the exception of a recess 33, is engaged by a roller 12 pivoted to one arm of a lever 6, the other arm of which engages a lever 13 secured to a rotatable and axially displaceable shaft 14. Lever 6 is pivoted at 34 to a vertically reciprocating slide 19 guided in suitable manner in the stationary frame of the machine. To shaft 14 is secured the toolholder 8 carrying` the cutting tool 7. @ne

vend of shaft 14 is provided with a roller 9 that en ages cam 3. A spring 16 surroundingshaft 14 and engaging lever 13 and bearing 15, serves to rotate the shaft in the direction ofthe arrow, (Figs. 1, 2 and 3), so as to hold lever 13 in permanent engagement with lever 6. Besides this function, spring 16 has thetendency to push shaft 14 toward the left to hold roller 9 1n engagement with cam 3. Slide 19 is provided with an upper roller 18 which is engaged by a wedge 10 carrying a roller 11 that engages cam 2. Roller 11 is held against cam 2 by a lever 17 engaging wedge 10 and influenced by a spring 36, while slide 19 is influenced by a spring 35.

As above stated, cams 1 and 3 make a series of rotations during the time cam 2 makes a single rotation. Cam 1 serves to hold the cutter against the work-piece, while cam 3 advances the same along such work-piece. At the end of each forward movement of the tool, roller 12 will engage recess 33 of cam 1, to allow spring 16 to withdraw the tool from the work-piece. Simultaneously, roller 9 will slide ofl" the raised portion of cam 3 to permit spring 16 to return shaft 14 to its initial position. During the consecutive reciprocations and rotations of shaft 14, cam 2 will gradually advance wedge 10 to raise slide 19 together with pivot 34 of lever 6. In this way the tool will gradually be brought nearer to the aXis of the workpiece, so as to deepen the cuts. After the operation has been finished, slide 19 is again lowered, roller 11 of wedge 1() engaging the reduced section of cam 2.

If it is required to cut longer or shorter screws the tappet 3 is interchanged for a larger or smaller one and, in order that the bolt or work in hand perform the correct number of revolutions, the wheels 22 and 23 are changed.. In the same manner, when it is required to cut a deeper thread, the tappet 2 can readily be changed, or the position of the critter or the driving mechanism can be altered.

Having now fully described my invention, 'what I claim as new and desire to secure by Letters Patent is:

1. In a screw cutting machine, a cutting tool, a first cam, means controlled by the rst cam for bringing the tool into or out of engagement with the 'work-piece, a second cam, means controlled by the second cam for gradually advancing the tool toward the axis of the work-piece, and a third cam for advancing the cutting tool along the workpiece, substantially as specified.

2. In a screw cutting machine, a cutter- IOO shaft, a vfirst Gain and a slide, combined With a lever fulcrurned to the slide and engaging said first Garn, a second Gain, means controlled by the second @am for raising and lowering the slide,` and means for operatively Connecting the cutter-shaft With the lever, substantially as specified.

3. In a screw cutting' machine, a Guttershaft, a rst Garn and a slide, Combined with a lever fulorurned t0 the slide and engaging said first earn, a second earn, means con trollel hy the second Garn for raising and lowerng the slide, a third Garn adapted to recproeate the cutter-shaft, and means for operatively Connecting the lever with the cuttershaft, substantially as specified.

-Signed by Ine at Dsseldorf, Germany, this twenty-ninth day of May 1906.

CARL VOGELSANG. Witnesses:

WILLIAM EssENWEIN, ALFR. POHLMEYER. 

